LEHI — A chemical that caused an explosion and injured a dental lab worker this week came from outside the lab, officials said.

A small explosion at Alpine Dental Lab, 1220 N. 500 West, burned a 75-year-old employee's hand and injured a woman Monday.

According to the lab's owners, the explosive material came from outside the lab and is not used in the building.

"It has been suggested that the chemicals in the lab are explosive, and they are not," Alpine Dental president Mark Seiter said in a prepared statement.

Investigators are still trying to determine how the chemical got inside the building.

Both the man and woman injured in the explosion suffered only minor injuries.